A 13-year-old boy suddenly lost his consciousness and developed generalized tonic-clonic seizures. Objectively, he presents with dilated pupils, no photoresponses, marked cyanosis of the face, biting of the tongue, white foam from the mouth, involuntary urination and defecation. According to the patient's medical history, such attacks occur from the age of three several times a year, the child constantly takes sedatives and anticonvulsants. What drug must be administered in this case?